function its_constructor_allows_a_list_of_engines(DifferEngine $engine)
{
$this->beConstructedWith(array($engine));
$engine->supports('string1', 'string2')->willReturn(true);
$engine->compare('string1', 'string2')->willReturn('string1 !== string2');
$this->compare('string1', 'string2')->shouldReturn('string1 !== string2');
}